The backcalculated modulus of subgrade reaction ( k -value), elastic modulus of concrete ( E ), and effective thickness ( h eff ) given the deflection basin from the Falling Weight Deflectometer (FWD) testing has been extensively used in evaluating the response and performance of in situ concrete pavements. Traditional backcalculation assumption of an interior-loaded infinite slab can lead to large errors in backcalculated parameters for edge-loaded continuously reinforced concrete pavement (CRCP) because of the load position and closely-spaced transverse cracks. In this paper, the backcalculaion formulas for edge-loaded CRCP with various crack spacing was proposed based on 2-D finite element analysis. According to the backcalculated results, both positive and negative temperature differentials of less than 16 °F had limited impact. As expected, the larger the lateral offset of the plate, the greater the impact on backcalculated results given the minimum error in h eff reaching 5.0% with a 4 in. lateral offset. In order to verify the proposed backcalculation method, a field CRCP test section with different base types and reinforcement ratio were evaluated. The impact of edge support provided by base layer was also shown to be significant, given the support of a 2 ft overwidth base showing the same impact of approximately 1 in. extra thick base.

中文翻译：

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一种基于边缘加载FWD测试的CRCP性能评估方法

根据落锤式挠度计 (FWD) 测试的偏转盆，回算的路基反应模量 (k 值)、混凝土弹性模量 (E) 和有效厚度 (h eff ) 已广泛用于评估响应和性能的现浇混凝土路面。由于荷载位置和横向裂缝密集，内载无限板的传统反算假设会导致边缘荷载连续钢筋混凝土路面 (CRCP) 的反算参数出现较大误差。 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 在本文中，基于二维有限元分析，提出了不同裂缝间距的边载CRCP的反算公式。根据反算结果，低于 16°F 的正负温差影响有限。正如预期的那样，考虑到 h eff 的最小误差达到 5.0%，横向偏移为 4 英寸，板的横向偏移越大，对反算结果的影响就越大。为了验证所提出的反算方法，对具有不同基层类型和配筋率的现场 CRCP 试验段进行了评估。考虑到 2 英尺超宽底座的支撑显示出与大约 1 英寸超厚底座相同的影响，基础层提供的边缘支撑的影响也被证明是显着的。